Hopefully this is an easy question and I just don't know the proper term for what I am trying to do. I am in real estate and pay a percentage of the money (6%) I earn to my brokerage up to a certain amount Each year ($3,000). I have multiple rows listing the date I get paid, the amount I will get paid, and the brokerage's split. How do I sum the total paid to the brokerage and stop it when it reaches a set amount?